Don't subvocalise. You can read faster, and fully comprehend what you're reading, but it takes a lot of the fun out of it and it might make what you've read more forgettable and make less of an impression upon you.

Don't read fast for the sake of finishing books. Not taking the time to read classics properly is worse than not reading them. I've learned this the hard way and have basically become a massive bellend.

I read in clumps of 3-5 words at a time. I thought I did it naturally but I read Tony Buzan's "Use Your Head" when I was a kid so maybe I picked it up then. You are purely reading for meaning so it destroys your appreciation of poetry and the rhythms of language until you hear it read aloud. It's also incredibly hard to read with a TV in earshot enough to make out the words as I can't tune it out. I never understood "You are now reading this in my voice" memes either as I don't read in anyone's voice.

1. When I start a book, I read the first chapter, and if I'm not hooked by the end of it I skip the whole book.

2. If I'm still reading after the first chapter and get to a boring patch, I read the first sentence of every page until it gets interesting again.

3. If it's clear that the author is padding out his work, or intentionally obfuscating it to hide its meaning from the plebs (Edward Bernays, Daniel Kahneman, etc.), I read the last paragraph of the whole work.

Every so often, I'll pick up a book I skipped before and try it again. As I have gotten older, some books have started making more sense to me while others have lost their appeal.